Phase structure and electrochemical properties of La0.67Mg0.33Ni3.0−xCox (x=0.0, 0.25, 0.5, 0.75) hydrogen storage alloys

Rare earth–Mg–Ni-based hydrogen storage alloys as negative electrode materials for Ni/MH batteries

“…Increase the lattice parameters and cell volumes [53,64,65,88,92,116,117] Decrease the plateau pressure and the hysteresis of hydrogen absorption and desorption Increase the hydrogen storage capacity Improve effectively the cyclic stability due to the decrease of cell volume change and the increase of the suface passivation Increase the electrochemical kinetics Mn…”

“…The roles played by Co in La-Mg-Ni-based electrode alloys have been extensively studied and elaborated [53,65,88,92,116,117,128]. Liu et al [65] revealed in detail the effects of Co content on the electrochemical properties of La 0.7 Mg 0.3 Ni 3.4−x Mn 0.1 Co x (x = 0-1.6) alloy electrodes by a series of electrochemical measurements.…”

“…Recently, a new alloy family of AB 3 -or A 2 B 7 -type rare earth-magnesium-based alloys with high specific capacity and good rate dischargeability was developed as the most promising next generation negative electrode materials for high energy and high power Ni/MH batteries. Numerous investigations have been conducted for their practical applications [22][23][24][25][26][27][28][29][30][111][112][113][114][115][116][117][118][119][120][121][122][124][125][126][127][128][129][130], especially in China and Japan. However, no systematical survey has been carried out on this newly developed hydrogen storage electrode alloy.…”

Annealing effects on structural and electrochemical properties of (LaPrNdZr)0.83Mg0.17(NiCoAlMn)3.3 alloy

“…A small amount of Zr was added into the formula to improve HRD as reported in the previous case of pure La [26]. Co is added to improve the cycle life by reducing the lattice expansion during hydriding and to result in less pulverization [27][28][29][30][31]. The addition of Al improves the cycle life by forming a dense oxide film on the alloy surface [32][33][34][35].…”

Microstructures and electrochemical performances of La0.75Mg0.25Ni3.5Mx (M=Ni, Co; x=0–0.6) hydrogen storage alloys

“…But the cycle stability of the alloy needs to be improved further. After investigated the structure and the electrochemical performances of the La 0.67 Mg 0.33 Ni 3.0−x Co x (x = 0.0-0.75) alloys, Luo and coworkers [4] found that the alloy (x = 0.5) obtained a maximum discharge capacity of 404.47 mAh/g, and the addition of Co significantly improved the cycle stability of the alloys. A systemic investigation on the influence of the stoichiometric ratio B/A on the structure and electrochemical performances of the AB 3.5-4.1 -type electrode alloys will be helpful to the development of the La-Mg-Ni-Co system electrode alloys.…”